Date: Mon, 15 Apr 2019 16:23:57 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r346239 - stable/11/sys/dev/nvme Message-ID: <201904151623.x3FGNvOI038127@repo.freebsd.org>
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Author: mav Date: Mon Apr 15 16:23:57 2019 New Revision: 346239 URL: https://svnweb.freebsd.org/changeset/base/346239 Log: MFC r339775: Put a workaround in for command timeout malfunctioning At least one NVMe drive has a bug that makeing the Command Time Out PCIe feature unreliable. The workaround is to disable this feature. The driver wouldn't deal correctly with a timeout anyway. Only do this for drives that are known bad. Modified: stable/11/sys/dev/nvme/nvme.c stable/11/sys/dev/nvme/nvme_private.h Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/dev/nvme/nvme.c ============================================================================== --- stable/11/sys/dev/nvme/nvme.c Mon Apr 15 15:35:42 2019 (r346238) +++ stable/11/sys/dev/nvme/nvme.c Mon Apr 15 16:23:57 2019 (r346239) @@ -104,6 +104,7 @@ static struct _pcsid { 0x05401c5f, 0, 0, "Memblaze Pblaze4", QUIRK_DELAY_B4_CHK_RDY }, { 0xa821144d, 0, 0, "Samsung PM1725", QUIRK_DELAY_B4_CHK_RDY }, { 0xa822144d, 0, 0, "Samsung PM1725a", QUIRK_DELAY_B4_CHK_RDY }, + { 0x01161179, 0, 0, "Toshiba XG5", QUIRK_DISABLE_TIMEOUT }, { 0x00000000, 0, 0, NULL } }; @@ -263,6 +264,25 @@ nvme_attach(device_t dev) if (status != 0) { nvme_ctrlr_destruct(ctrlr, dev); return (status); + } + + /* + * Some drives do not implement the completion timeout feature + * correctly. There's a WAR from the manufacturer to just disable it. + * The driver wouldn't respond correctly to a timeout anyway. + */ + if (ep->quirks & QUIRK_DISABLE_TIMEOUT) { + int ptr; + uint16_t devctl2; + + status = pci_find_cap(dev, PCIY_EXPRESS, &ptr); + if (status) { + device_printf(dev, "Can't locate PCIe capability?"); + return (status); + } + devctl2 = pci_read_config(dev, ptr + PCIER_DEVICE_CTL2, sizeof(devctl2)); + devctl2 |= PCIEM_CTL2_COMP_TIMO_DISABLE; + pci_write_config(dev, ptr + PCIER_DEVICE_CTL2, devctl2, sizeof(devctl2)); } /* Modified: stable/11/sys/dev/nvme/nvme_private.h ============================================================================== --- stable/11/sys/dev/nvme/nvme_private.h Mon Apr 15 15:35:42 2019 (r346238) +++ stable/11/sys/dev/nvme/nvme_private.h Mon Apr 15 16:23:57 2019 (r346239) @@ -245,7 +245,8 @@ struct nvme_controller { uint32_t ready_timeout_in_ms; uint32_t quirks; -#define QUIRK_DELAY_B4_CHK_RDY 1 /* Can't touch MMIO on disable */ +#define QUIRK_DELAY_B4_CHK_RDY 1 /* Can't touch MMIO on disable */ +#define QUIRK_DISABLE_TIMEOUT 2 /* Disable broken completion timeout feature */ bus_space_tag_t bus_tag; bus_space_handle_t bus_handle;
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